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I was thinking to cut the brass down to 73mm and then ram it into a .450/400 3,25” die. Isn’t that enough cut the die shorter to sqeeze the neck even further down untill the case enter the chambers freely. Fill the case up with bp and shoot a .41” round ball to just fireform. From here I can get a toolmaker overhere to make some simpel dies and a fixer. It doesn’t have to be science....or ofcouse to commit the ultimate sin...ream the chambers up 450/400 3,25”....Problem solved and from here the world lay open

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Yeah...I don’t know about doing this, Jens. I recently bought a 450/400 3.25” BPE. Turned out to have been a subject of several discussions here back in 2010 and 2011. It’s a Lancaster double rifle. You and I each recently bought some dies off of a guy at AfricaHunting, and while I’m limping along using the .412” NE dies I luckily got there, it’s not as easy as you would think. If you re-bored the gun, you’d probably just be trading one problem/ challenge for another.
Presently I’m pursuing a truly custom die set from CH4D, for a .408” bullet, using modern Kynoch BPE brass I bought. Hopefully I don’t experience what Daryl got. My long experience with CH4D has always been quite perfect. Hope it remains this way

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